Frequencies for first 10,000 rows of eimage variable in namcs2007 dataset :

   if yes, are |
    electronic |
        images |
     returned? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        489        4.89        4.89
       unknown |        571        5.71       10.60
not applicable |      6,188       61.88       72.48
           yes |      1,754       17.54       90.02
            no |        998        9.98      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016